[NaCl SDK] cleanup python unittests

[NaCl SDK] Cleanup python unit tests.

Python unit tests file should ends with _test.py rather
than start with test_.

Run zip tests and generate_make rate_make tests as part of test_all.py

Remove two old test cases from generate_make tests.


BUG=

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=173306

[binji, 2012-12-14 23:13:57]

lgtm, thanks!

https://codereview.chromium.org/11571032/diff/4001/native_client_sdk/src/buil...
File native_client_sdk/src/build_tools/tests/test_all.py (right):

https://codereview.chromium.org/11571032/diff/4001/native_client_sdk/src/buil...
native_client_sdk/src/build_tools/tests/test_all.py:13:
#sys.path.append(os.path.join(SDK_DIR, 'tools'))
remove unused code

[commit-bot: I haz the power, 2012-12-14 23:26:11]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sbc@chromium.org/11571032/5014

[commit-bot: I haz the power, 2012-12-15 04:25:41]

Retried try job too often on win_rel for step(s) browser_tests

[commit-bot: I haz the power, 2012-12-15 16:10:02]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sbc@chromium.org/11571032/5014

[commit-bot: I haz the power, 2012-12-15 20:07:19]

Change committed as 173306

[bsy, 2012-12-18 00:07:34]

this CL accidentally included https://codereview.chromium.org/11547009/ (which
had an l.g.t.m. already but had some [verbal] cleanup suggestions planned).  the
cleanup for that CL continues in https://codereview.chromium.org/11624005/